[jhautz]

neil is right on with what I would sugest. Make sure you pick a pack that is capable of at least 80A continuous. Thats about the breaking point I have found for a 4-5s setup. Less than that and you will be pushing the cells very hard and likly not get the life you would expect from them. IMO the TrueRC 5000 is not really the best choice, they are a bit under rated for a big truck. If it were me, I would go with the Zippy 20C 5000mah pack. I have a few of those Zippy packs in 5000mah 4s and they are proving to be very nice cells for the $$$. In fact, when the 5000mah 5s Zippys come back into stock I'm planning to pick a couple up to use as extra practice packs so I can do less charging at the track and still run all day.